Age-related differences in brain activity underlying working memory for spatial and nonspatial auditory information

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Human Aging Research

Background:

• Working memory (WM) is crucial for cognitive function and can be affected by aging.
• Auditory working memory involves processing both spatial and nonspatial information.
• Understanding age-related differences in auditory WM neural mechanisms is important.

Purpose of the Study:

• To investigate age-related differences in brain activity during spatial and nonspatial auditory working memory tasks.
• To examine sustained and transient brain activity patterns in younger and older adults.
• To explore the neural correlates of successful auditory working memory performance in aging.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed.
• A 1-back task assessed working memory for sound location (spatial) and sound category (nonspatial).
• A mixed block-event-related design captured sustained and transient brain activity.

Main Results:

• Both age groups showed distinct brain activation patterns for spatial and nonspatial auditory WM, with no significant age differences in these patterns.
• Older adults exhibited greater sustained activity in the left prefrontal cortex (PFC) during both tasks.
• Older adults demonstrated reduced target-related activity modulation in the auditory cortex during the category task, linked to performance.

Conclusions:

• Neural activity patterns for auditory working memory are largely preserved with age.
• Increased PFC activity in older adults may reflect compensatory engagement of task-monitoring processes.
• Age-related difficulties in auditory WM may stem from impaired activity modulation in the auditory cortex, particularly for nonspatial features.